Done this many times at shuswap... been houseboating there for 7-8 years now.
I tow with a simple 45-50' line off the back of the houseboat railings. I use a quick release off the boat end just to make it easy to click on and off whenever. No big deal towing, just make sure its a strong enough rope.. braided tube tow ropes work fine. Just remember to take out the slack of the line first, but not like those houseboats really have enough torque to snap a line,.. just a safety precaution. And of course when just floating in the lake, keep an eye so your xlv doesn't swing around and smack the houseboat.. can happen in the busier areas of the lake with all the traffic.
Now for anchoring.. I don't recommend tying up right next to your houseboat like in the above picture. The houseboats are way higher than your boat and on most of them the walls come right to the edge (not like a walkway in the above picture with railings) so you end up smacking your tower and racks (if you don't have swing - aways) against the houseboat all night. And being a long weekend it will be BUSY... especially if you beach at Neilsen, Marble, or anywhere near the narrows. People race around so close to the beaches until dark so it makes a bit of a mess on the water
I always use an anchor with a anchor buddy (google it if you don't know) and throw the anchor off the bow of the wakeboat about 20' from the houseboat. It's usually 25-40' at that distance (100') from shore so you won't need a super long line. Then use your tow line on your rear eyelets above the swim grid to keep it attached to the houseboat. Makes it super easy to pull your way back to the houseboat then safely float away back to its anchor spot... So its either get an anchor buddy or you're swimming. Believe me, this is by far the safest way to keep your boat overnight.
If you can't find an anchor buddy in time for the weekend, here's an alternate way. Anchor beside your houseboat and tie up to the angled lines that you use to tie the stern of the houseboat to shore. (Like the large yellow line in the pic above). This way you are safely floating away from the houseboat as that line should be tight all night if anchored to shore properly. Downfall to this is you are def swimming before/after anchoring... and the water can be COLD first thing in the am
If you do go to the busy beaches, try and pick a spot inbetween two boats so there is a decent gap for ONLY your houseboat to fit into. People cram for spots on the beaches and you might end up with another houseboat right beside you overnight. Then when people try and reverse out in the morning, accidents happen. I had a houseboat hit my old I/O when it was anchored behind and sunk it on Marble Point about 6 years ago. So needless to say, I'm a light sleeper on a houseboat now... always up early to make sure to get my boat out of the way.
One last tip... this should be obvious but I've seen it done more than once! Don't try and beach the boat with the wakeboat still attached to the tow line... Seen a lot of crushed bows into the back of houseboats on the beaches. Its amazing that people don't know what forward momentum is!
Anything else let me know... I'm a seasoned vet of the shwap...